Loom



April 30, 1929. J HARRIS 1,711,385

LOOM

Filed April 13, 1927 l ATTORNEY Patented Apr. 30, 1929.

UNITED STATES ARTHUR J. HARRIS, OF PATERSQN, NEW JERSEY.

Application filed April 13, 1927. Serial No. 183,415.

This invention relates to looms and particularly to that part of their mechanism which is devoted to maintaining taut the advanceable sheet of warp and woven fabric. The principal object is to provide for the letting off of the sheet in an even manner, using mechanism for the purpose that is at once simple and easily manipulated and controlled; the invention, however, is applicable in any case Where, given some instrumentality, as the sand-roller, resisting lengthwise movement of such a lengthwise advanceable sheet and a revoluble beam, as the cloth-beam, tractively engaged with the sheet and'coactive with said instrumentality to tauten the sheet, the beam is subjected to force acting to turn it in the direction to cause such tautening. i

in the drawing,

Fig. 1 shows in side elevation the warpbeam, cloth-beam, sand-roller and frame of a loom, with the sheet of warp and woven "fabric; and

Fig. 2 is a side elevation of the invention, partly in section;

Fig. 3 a plan thereof.

ln l ig. l the warp end portion A of the advanceable sheet is assumed to be tractively engaged by, as by being wound on, the beam 1 and its woven-fabric end portion B to be tractively engaged by, as by being wound on, the beam 2, and 3 is the sand roller forming part of the (take-up) means for advancing the sheet. In the example the instrumentality to resist lengthwise movement of the sheet having coactive therewith either beam to tauten the sheet is assumed to be the sandroller. This is all according to the usual construction and arrangement. Fig. 1 is present in the drawing simply to aiiord a graphic representation of the two beams (as l and 2) to either of which my invention is applicable. The invention, however, is assumed in the other views to be applied to the beam 1.

Given an instrumentality (as 3) having the stated function of resisting lengthwise movement of the lengthwise advanceable sheet A the invention contemplates mechanism to subject the beam on which the sheet of warp and woven fabric is wound to a force active to rotate the beam in the direction to tension the sheet including a revoluble worm wheel having its axis fixed and adapted to be connected with the beam, a revoluble worm meshing with the w0rm-wheel and being normally urged around the axis of and thereby active on said worm-wheel in- In Fig. 2, connected (as fixed) to rotate with the beam 1 is a worm-wheel 14 with whose toothed periphery (here affording what I have termed its purchase-affording way) meshes with the thread of a worm 15 which is journaled in a bracket 16 pivoted on a trunnion of the beam; the part 15 normally exerts force (here by gravity) on the gear member 14 and hence on the beam in the direction for causing the latter to tauten the sheet, and to obtain the proper degree of such force any weighting means,

as 17 attached to a chain or equivalent 18 extending around and secured to a drum 19 on the bracket may be provided.

A ratchet 20 is journaled on the beam trunnion and is adapted to transmit the turning movement to the worm 15 through suitable gearing 21, 22, 23 and 24 of which 21 and 2 1 are respectively fixed to the ratchet and worm and 2223 are united to turn together in the bracket 16. A pawl b'ar, 25, is suitably supported inany way and is reciprocated from an eccentric 12 on the camshaft of the loom. In operation, while the sheet is being advanced, tending of course to rotate the entire system of intergeared parts clockwise in Fig. 2, the pawl-bar turns the ratchet wheel 20 in the opposite, direction, resulting in feeding'the worm counterclockwise with respect to the worm-wheel and beam. Since the mot-ion of the ratchet wheel is constant, whereas the rate of rotation of said system variesas the operation proceeds due to change in diameter of the wound mass on the beam, a hand-wheel or handle 30 on the worm is provided by which the weaver manually rotates the worm and thus adjusts it around the wormw-hecl.

It will be apparent that the Weaver can readily relieve the tension on the sheet or restore it by turning the Worm, as by its handle 30, in the appropriate direction so that it creeps in the proper direction along the toothed surface of the Worm-Wheel. (In the dotted-line position of the parts in Fig. 2 the tension has been relieved.)

Having thus fully described my invention,

What I claim is:

Mechanism to subject a beam on Which is Wound one end portion of a sheet consisting for a portion of its length of Warp and for the remainder of its length of Woven fabric to a force active to rotate the beam in the direction to tension the sheet including a revoluble Worm-Wheel adapted to be connected with the beam and having its axis fixed, a revoluble Worm meshing with the worm-Wheel and; being normally urged around the axis of and thereby active on said Worm-Wheel in the direction to Wind the sheet on the beam, and means confining said Worm and Worm-Wheel in their intermeshing relation to each other, in combination with a Worm-rotating member concentric and geared with the worm-Wheel, and means to rotate said member step by step.

In testimony whereof I aflix my signature.

ARTHUR J. HARRIS. 

